Re: [PATCH] spi: bcm2835: Implement shutdown callback

[Lukas Wunner <lukas@xxxxxxxxx>]

On Thu, May 28, 2020 at 12:06:05PM -0700, Florian Fainelli wrote:
> Make sure we clear the FIFOs, stop the block, disable the clock and
> release the DMA channel.

To what end?  Why is this change necessary?  Sorry but this seems like
an awfully terse commit message.

Thanks,

Lukas

> 
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> ---
>  drivers/spi/spi-bcm2835.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
> index 20d8581fdf88..237bd306c268 100644
> --- a/drivers/spi/spi-bcm2835.c
> +++ b/drivers/spi/spi-bcm2835.c
> @@ -1391,6 +1391,15 @@ static int bcm2835_spi_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static void bcm2835_spi_shutdown(struct platform_device *pdev)
> +{
> +	int ret;
> +
> +	ret = bcm2835_spi_remove(pdev);
> +	if (ret)
> +		dev_err(&pdev->dev, "failed to shutdown\n");
> +}
> +
>  static const struct of_device_id bcm2835_spi_match[] = {
>  	{ .compatible = "brcm,bcm2835-spi", },
>  	{}
> @@ -1404,6 +1413,7 @@ static struct platform_driver bcm2835_spi_driver = {
>  	},
>  	.probe		= bcm2835_spi_probe,
>  	.remove		= bcm2835_spi_remove,
> +	.shutdown	= bcm2835_spi_shutdown,
>  };
>  module_platform_driver(bcm2835_spi_driver);
>  
> -- 
> 2.17.1
>